Concrete-form.



M. STIELER.

CONCRETE FORM.

APPLICATION FILED AUG.II. |915A 64,319. IPatented 1160.111915.

. 2 SHEETS-SHEET M. STIELER.

CONCRETE FORM.

APPLICATION FILED AUG. Il, 1915. 1.164.819. Patented 1160.111915..

2 SHEETS-SHEET 2.

@IgM/'U2 COLUMBIA PLANOGRAPH Co..WAsH|NaTON, D. C.

MARTIN STIELEBJ, OF CHICAGO, ILLINOIS.

CONCRETE-FORM.

Specification of Letters Patent.

Patented Dec. 1d, 1915'.

Application lcd August '11, 1915. Serial N o. 44,968.

To all whom t may concern Be it known that I, MARTIN STIELER, a citizenof the United States, and a resident of the city of Chicago, county ofCook, and State of Illinois, have-invented certain new and usefulImprovements in Concretef Forms, of which the following is aspecilication.

My invention relates to improvements in concrete forms, and has for itsobject the provision of an improved construction of this characterarranged to facilitate and expedite the building of concrete 'structuresof various forms and shapes.

The invention consists yin the combinations and arrangements of partshereinafter described and claimed.

The invention will be best understood by reference to the accompanyingdrawings forming a part of this specication, and in which, 1

Figure 1 is a vertical section showing a portion of a form embrdying myinvention, also a portion of a chimney as built by the form, said figurebeing a section taken on line 1-1 of Fig. 5, Fig. 2, an enlargedelevation of a cable winding drum employed in the construction, Fig; 3,a section taken on line 3-3 of Fig. 2, Fig. 4, a side view of the cablewinding construction, Fig. 5, a partial horizontal section of the form,Fig. 6,.an enlarged elevation illustrating the form of plates employedin the construction, Fig, 7, a section taken on line 7-7 of Fig. 6, Fig.8, an enlarged section illustrating the method of attaching plates totheir stifliening bars, and Fig. 9, an enlarged vertical section of aninteriorV plate of the form, taken on line 9 9 of Fig. 5.

The preferred form of construction, as illustrated in the drawings,comprises an outer and an inner form member. said members being arrangedconcentrically so as to form sections of the chimney. The outer formconsists of a plurality of flexible sheet metal plates 10 outwardlyoffset at one edge 11 to rest loosely over the corresponding edges ofthe adjoining plates. Vertical stiifening bars 12 and 13 are secured tothe outer side of each of the plates 10, the bar 12 being secured alongthe edge opposite said offset portion 11 and bars 13 being equallyspaced across the body of the plate, as shown, there being three of thebars 13 employed. Each of the bars 12 is provided with a lateralextension 14 arranged to overlap the corresponding portion l10n theadjoining plate. The bars 12-13 aresecured to the plates 10 by means ofscrewbolts 15, the inner ends of the bolt-holes through said bars beingcountersunk at 16, so that when the bolts are tightened'in po-V sition,the corresponding portions of plate 10 will be drawn into saidcountersinlzs thus providing a secure connection betweenthe bars and theplates and providing a smooth inner surface on the plates, as shown inFig.

8.; Bars 12--13 are outwardly offset at their upper-portions 17-18 andat their lower portions 19-20 and a plate 2l is mounted under the upperoffset portions, said plate being adapted to fit under the lower offsetportions on the next plate above and thus constitute abond between theplates at their tops and bottoms, as will be readily under stood. Theplates 11 are provided with elongated slots 22 fitting the correspondingbolts 152so as to permit of latitude of movement between the bars andthe plates and thus permit of changes in curvature in plates V10.

At one end each of the plates 21 is provided with a bifurcated extension23 adapted to engage the corresponding bolt 24 on the adjoining platethus effecting a good lateral bondloetweenV the plates 10. Steps in theform of triangular loops 25 are secured to the cuter sides of one of thebars 13 0n each 0f the plates 1() and cables 26 are passed around theplates 10 immediately above the steps 25 so as to hold the same inplace. said steps 25 thus serving to properly position the cables 26 andat the same time 'as means of supporting' workmen on the exterior `oftbe form. One end of each of tbe cables 26 is anchored to a bolt 27secured between two angle irons 28 fastened to the outside of one of theplates 10. The other end of each of the cables 2G is angularly bent andpassed through a perforation 29 in a winding drum 30 rotatably mountedbetween angle `irons 28.

An eccentric clamping lever 31 is arranged in each of the drums 30 toclamp the corresponding end of the corresponding cable 26 in perforation29 so as to prevent withdrawal of the same. Drum 30 carries a ratchetwheel 32 cooperating with a pawl 33 and a squared trunnion 34 by meansof which said drum may be engaged and rotated by a wrench. By thisarrangement, the plates 10 may be nicely drawn and held. in properpositions.

' modifie The interior porti-on of the mold is made4 up of plates 10identical yin all respects with the plates l0 in the exterior part ofthemold except that hooks 35 are provided `:on the bars 12-13 instead of'steps 25. VIn this instance, the plates are secured in proper form bybarsV or rods 36' provided inthe hooks 35 and overlapping at their ends,as shown.

In practice, a certain `number of sections are made up and the concreteconstruction formed in the .usual manner. Then additional sections arearranged above 4 the other sections, the lowermost sections beingremoved and `the construction completed in this manner. vTheconstruction illustrated is shown as employed for constructing a chimneywhich has an .upwardly tapering `conical outer wall 37 andan inner wall35 which -llares slightly outwardly and upwardly. Owing to theflexibility of the plates 10 and the latitude for adjustment afforded,the form can be arranged to turn 'out a smooth and accurate constructionsuch as illustrated. When the exterior diameter decreases sufciently,one plate 10 is omitted from the outer form, the latitude vof adjustmentof' the plates permitting of this.

'While I have illustratedand described the vpreferred form ofconstruction for carrying my invention into effect, this is capable ofvariation'and modification without departingfrom -the spirit of theinvention. I, therefore, do not Wish to be limited toy the precisevdetails of construct-ion set forth, but desire to avail myself' of suchvariations and ations as come Within the scopeuof the appended claims.`

Having described my invention what -I claim as new and desire to secureby Letters latent is:

1. A concrete form comprising aplurality of plates offset and looselyoverlapping at theirl side edges; cables encompassing said plates; andmeans for 'tightening said cables, substantially as described.

i 2, A concrete form comprising a plurality of 4flexible plates offsetand loosely overlapping Aat their side edges; `-cables encompassingsaidplates; andV means for tightening said cables, substantially asdescribed.V 3. A concrete form comprising a plurality of' plates -offsetand loosely overlapping at their side edges; vertical stiffening bars onsaid plates, said bars fbeing outwardly offset at top and bottom;platesjplaced under said at top and bottom; plates placed under said voutwardly offset bar portions; cables enceinpassing said plates; andmeans for tightening said cables, substantially as described.

6. A concrete form comprising a plurality of flexible plates offset andloosely overlapping at their side edges; vertical stifening bars on saidplates, said bars being outwardly offset at top and bottom; platesplaced under said outwardly offset bar portions; cables encompassingsaid plates; and means for tightening said cables, substantially asdescribed.

7. AA concrete form comprising a plurality of flexible plates offset andloosely overlapping at their side edges; vertical stiffer.- ing bars onsaid plates, said bars being outwardly offset at top and bottom; platesplaced under said outwardly offset bar portions; steps -in the form 4oftriangular loops secured to said bars; cables encompassing said platespassing above said loops; and means for tightening said cables,substantially as described.

8. A concrete form comprising a plurality of flexible plates offset andloosely overlapping at theirfside edges: vertical stiftening bars onsaid plates, said bars being outwardly offset at top and bottom; platesplaced under said outward-ly offset bar portions; a plurality of hookmembers secured to the outer faces of' said bars; and securing barsplaced in said'hoolfs, substantially as described.

lIn testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

MARTIN STIELER.

Vitnesses:

JOSHUA R.Y H. Po'rTs, HELEN F. '-LILLis.

Copies of this -patent may be yobtained for five cents each,byaddressing .the .Commssioner of VPatents 'Washington, .`D..C.

